You may have to do it multiple times or try the head flushing. Either way, the cyan is clogged or not printing correctly. If it gets better on the nozzle check after each cleaning, then I would continue until the check prints correctly. A complete nozzle check print is what you are looking for. Any broken or missing lines will mean that the head is partially or completely clogged. The cleaning process will use ink from ALL colors, so make sure that you have more cartridges on hand. You won't want to go through the cleaning process to run out of ink and have to do it all again.